This paper investigates the ability of aggregate and disaggregate equations to account for the boom in UK plant and machinery investment in the second half of the 1990s. We extend previous US research by Tevlin and Whelan (2002) by explaining the failure of the aggregate equations more formally in terms of misspecification when relative prices are trending; and by conducting the econometric analysis in a formal cointegration framework. In line with the US research, we find asset-level equations can explain the UK investment boom over this period, whereas the aggregate equation completely fails.
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